M81 (Bode's Galaxy) and M82 (Cigar Galaxy)

Object Information:

Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a spiral galaxy about 12 million light-years away in theconstellation Ursa Major. Due to its proximity to Earth, large size and active galactic nucleus (which harbors a 70 millionM[8] supermassive black hole), Messier 81 has been studied extensively by professional astronomers. The galaxy's large size and relatively high brightness also make it a popular target for amateur astronomers

Messier 82 (also known as NGC 3034Cigar Galaxy or M82) is a starburst galaxy about 12 million light-yearsaway in the constellation Ursa Major. It is about five times more luminous than the whole Milky Way and one hundred times more luminous than our galaxy's center.[6] The starburst activity is thought to be triggered by interaction with neighboring galaxy M81, and M82 is a member of the M81 Group. As the closest starburst galaxy to our own, M82 is the prototypical example of this type of galaxy.[6] SN 2014J, a Type Ia supernova, was observed in the galaxy on 21 January 2014,[7][8][9] see 2014 supernova. In 2014, in studying M82, scientists discovered the brightest pulsar yet known, designated M82 X-2

 

Watch the image of M81 and M82 reprocessed in three different ways:

Second reprocessed image,14-02-2016. Lights 13x600" (Star Tools):

Third reprocessed image, 16-02-2016. Calibrated and stacked again with DSS, this time only using the best 9x600" light images. Processed with Star Tools:

Fourth reprocessed image, 16-02-2016 (the one shown above). Lights 13x600" (Star Tools:)

In this new images, having stretched it properly, I have been able to keep some data that shows the satellite galaxy of M81. This dwarf galaxy, called Holmberg IX, has an apparent magnitude of 16. In this miniature image you can see the small galaxy:

Holmberg IX is a dwarf irregular galaxy and a satellite galaxy of M81. The galaxy is named after Erik Holmberg who first described it, although the galaxy was discovered by Sidney van den Bergh in 1959. Based on the observed age distribution of stars it contains it is thought to have formed within the last 200 Myr making it the youngest nearby galaxy.

Image date:

February 05, 2016

Exposure Information:

2h10' exposure
Lights: 13x600" 800ISO
Darks: 10
Flats: 30
Bias: 50

Imaged at:
Prades, Tarragona. CATALUNYA - SPAIN
Equipment:

Optics - GSO- 200/1000 Newtonian f/5
Camera - Canon 450D moded (IR filter removed)
Mount - Sky-Watcher Neq6 PROII
Guiding scope – EZG 60/230
Guiding and planetary càmera – ASI 174MC